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iIrth <br /> March 15, 2022 Earth Solutions NW LLC <br /> ES-7852.01 Ceotechnical Engineering, Construction <br /> Observation/Testing and Environmental Services <br /> Pacific Ridge — DRH, LLC <br /> 17921 Bothell-Everett Highway, Suite 100 <br /> Bothell, Washington 98012 <br /> Attention: Mr. John Mirante <br /> Dear Mr. Mirante: <br /> Earth Solutions NW, LLC (ESNW) is pleased to present this report titled "Geotechnical <br /> Engineering Study, Proposed Residential Development, Benton Square, 18t"Avenue West and <br /> 100t" Street Southwest, Everett, Washington". Based on the results of our study, the proposed <br /> residential development is feasible from a geotechnical standpoint. Based on the conditions <br /> observed during our fieldwork, the subject site is underlain primarily by glacial till deposits and <br /> areas of existing fill within the western/southwestern portion of the site. <br /> The existing fill encountered within the western/southwestern portion of the site is not suitable for <br /> structural support in its current condition. We recommend overexcavating and replacing the <br /> existing fill or supporting structures on pipe piles. Recommendations for overexcavating and <br /> replacing the existing fill are provided in this report; ESNW can provide recommendations for pipe <br /> piles, or other deep foundation options, upon request. <br /> After completing earthwork activities in accordance with recommendations in this report, the <br /> proposed structures can be supported on conventional spread and continuous foundations <br /> bearing on undisturbed, competent native soil, recompacted native soil, or new structural fill. <br /> Where loose or unsuitable soil conditions are encountered at foundation subgrade elevations, <br /> compaction of the soils to the specifications of structural fill, or overexcavation and replacement <br /> with suitable structural fill will likely be necessary. A representative of ESNW should confirm <br /> suitability of foundation subgrades at the time of construction. <br /> Due to the high moisture sensitivity of the site soils, foundation subgrade areas should be <br /> protected from wet weather or areas of remediation should be anticipated; a layer of crushed rock <br /> can be considered to protect foundation subgrade areas. If structural building pads are disturbed <br /> during wet weather, remediation measures such as cement treatment or overexcavation and <br /> replacement with rock may be necessary in some areas. Additionally, perched groundwater <br /> seepage may create unsuitable soil conditions above the hardpan which would require aeration, <br /> cement treatment, or replacement with crushed rock. <br /> 15365 N.E. 90th Street,Suite 100 0 Redmond,WA 98052 0 (425)449-4704 • FAX(425)449-4711 <br />